public class Test2 {
    public static void main(String[] args) {
//        People p1 = new Teacher();
//        People p2 = new Student();
//        Test2 p = new Test2();
//        p.chifan(new Teacher());
    }
    public void chifan(){

    }
    public void chifan(People people){
        people.eat();
    }
}
